Hi fellas, I just wanted to include a data point for those wondering about the new Tailfin frame bags and if it'll fit their bike. I recently bought a 2.7L wedge frame bag (the middle choice of three wedge bags) and one Bottle Dropper for downtube placement for my 54cm Specialized Aethos and this is what it looks like. Without the four t-shirts stuffed into the wedge bag, the bag touches the water bottle spout; with them, it lifts the bottom of the bag up and eliminates contact. The water bottles are 22 oz and 34 oz/1L. Bottle cages are the Specialized Zee Cage (Right) for the downtube and the Specialized Rib Cage for the seat tube. The Bottle Dropper allowed me to slide the bottle cage down by one inch; there's slight contact with the other bottle but it's fine. Tailfin's virtual fitter (3rd picture) is reliable.
by Patient-Platypus258